Complete the table of values for y=x^2-x

Serena is making an experiment. for that, she needs 20 grams of a 52% solution of salt. she has two large bottles of salt water: one with 40% and the other with 70% of salt in them. how much of each must she use to make the solution she needs? i am in need of

Sum of the interior angles of a pentagon

What is the value of x? enter your answer in the box. x =